The method of exporting videos from AliExpress is as follows:

1. Log in to the AliExpress platform and enter the seller center.

2. On the seller center page, find the details page of the corresponding product and click the "Product Video" button.

3. On the pop-up video editing page, check the video you want to export.

4. Click the "Download Video" button, select the video format (such as MP4, AVI, etc.), and then click "OK".

5. Wait for the video to download. You can find the downloaded video file in the specified folder.

In addition, if you want to generate a video from the product pictures of AliExpress, you can refer to the following steps:

1. Log in to the AliExpress platform and find the details page of the corresponding product.

2. On the product details page, click the "Generate Video from Picture" button.

3. Select the pictures you want to generate videos for. You can select up to ten pictures.

4. Set parameters such as video size, transition effects and background music.

5. Click the "Preview Video" button to view the generated video effect.

6. If you are satisfied, click the "Replace Product Video" or "Save As" button to save the video on your local computer or in the AliExpress product details page.

It should be noted that some functions may require AliExpress membership or paid activation. Please refer to the actual situation for specific operation permissions.